Drawing-board.



N0. 889,072. PATENTED 26, 1908- W. P. WAGNER. DRAWING BOARD. 7APPLICATION FILED JAN. 5, 190']. RENEWED OUT. 14, 1907.

2 SHEETS-SHEET l.

{I}. I W, M/ z 1w f1 will 1 iill fil 2 M a n a w MM K u .m m 7 .7 Hm m mu m q/ 5 r F/ w a" ww T 1 3 M v fl i-+ "a 5 NH w m V 5 Tun-Noam: PETERScm, wasnmcmm, n. c.

No. 889,072. PATENTED MAY 26, 1908. w. P. WAGNER.

DRAWING BOARD. APPLIOATIOH FILED JAN. 5, 1907. RENEWED Q01. 14, 1907.

2 SHEETS-SHEET 2 20 Z/ Fig.8.

z 26 25 22 2 8 I U 2 i anvqnfo'c Wham rypncr Witnesses WILLIAM FRANKLINWAGNER, OF WASHINGTON, DISTRICT OF COLUMBIA.

DRAWING-BOARD.

Application filed January 5, 1907, Serial No. 351,005. Renewed October14,

Specification of Letters Patent.

Patented May 26, 1908.

1907. Serial No.-397,390.

To all whom it may concern:

Be it known that I, WILLIAM FRANKLIN WAGNER, a citizen of the UnitedStates, residing at Washington, in the District of Columbia, haveinvented certain new and useful Improvements in Drawing-Boards, of whichthe following is a specification.

My invention relates to improvements in drawing boards and moreparticularly to that class of drawing boards used by archidraftsmen andartists who v require the material on which they work to be stretchedand held very tightly and smoothly.

The object of the invention is to provide a drawing board on which anythickness or quality of paper or other material can be quickly appliedwithout gluing, tacking or otherwise permanently securing the same.

It also has for its object to provide a drawing board on which paper canbe readily applied and stretched, without wetting, to any desiredtension and after being applied and stretched any looseness or wrinklescaused by the shrinkage or expansion of the paper can be completelyeliminated. v

It further. has for its object to rovide means whereby paper may beapplie or removed from the drawing board as often as desired so that ifa drawing is commenced and it is desirable for any urpose to remove itfor a time before comp eting the same it can be easily and quicklyremoved and then applied again at any future time without in theslightest degree affecting the drawing.

It still further has for its object to provide a drawing board whichwill not be affected by shrinkage and which can be manipulated to adjustthe T square thereon to any line or lines desired, which sometimesbecomes necessary when replacing a drawing thereon to be completed andthe drawing has not been applied thereon exactly as it was in the firstinstance.

Referring to the drawings Figure. 1, is a top plan view, Fig. 2, alongitudinal sectional view on the line a;n; of Fig. 1. Fig. 3, a crosssectional view on the line yy of Fig. 1. Fig. 4, a bottom plan view.Fig. 5, a sectional view of the end of one of the cleats. Fig. 6, asectional view of the stationary edge of the board. Fig. 7, a sectionalview on the line 2-2 of Fig. 5. Fig. 8, a sectional view on the line ZZof Fig. 5. Fig. 9, a detail sectional view of one of the corners of theboard.

In the drawings in which like numerals of reference denote like partsthroughout the several views, 1, represents the body or main portion ofthe drawing board which is provided at one side, preferably the leftside for the convenience of having a rigid surface for the use of aT-square, with a stationary edge 2, having a longitudinal slot 3, in itsupper surface, said slot being provided with an inclined bottom 4, anundercut or inwardly slanting side wall 5, and a straight vertical wall6. 7

The drawing board is provided with cleats 7, 8, 9, & '10. Cleats 7 & 8are secured to the body of the drawing board by means of screw bolts 11,which pass through elongated slots 12, in said cleats and into the bodyof drawing board and said cleats extend beyond the side of the drawingboard. Cleats 9', and 10 are secured to the body of the drawing board bymeans of screw bolts 13, which pass through elongated slots 14, in saidcleats into the drawing board and said cleats also extend beyond theside of the drawing board. Three extensible edges 15, 16, & 17 areprovided each being the counterpart of the other, the edges 13 & 16being mounted on and designed to be slid on the projecting ends of thecleats 7 8r, 8, and the edge 17, is mounted on and is designed to beslid on the projecting ends of the cleats 9 & 10. Each of the saidextensible edges is provided with a longitudinal slot 18, in its uppersurface having an inclined bottom, 19, an inwardly slanting or undercutside wall 20, and a straight vertical side wall 21. The extensible edgesare also provided with screw bolts 22, which pass through casings 23,and their heads are mounted in laterally extending elongated slots 24,formed in the several cleats and the squared portions adjacent saidheads are mounted 1n slots 24 also formed in the several cleats, 25,being screw thumb nuts which are mounted and are designed to travel onthe screw bolts 22, and adjust the extensible edges inward and outwardfrom the body of the drawing board. The screw thumb nuts 25 projectslightly below the under surface of the cleats so that they may bereadily grasped by the fingers and turned to adjust the extensibleedges. Said thumb nuts are also provided with holes 26, in which a nailor other instrument may be inserted to turn them if for any reason it isfound that they do not work freely enough with the fingers.

27, is a iece of paper or other drawing material which is securelyclamped in the slot 3, of the edge 2, and the slots 18, of the boardrelease the extensible edges 15, 16 clamping strips 28.

The clamping strips are preferably made of nickeled spring steel, butthey may be made of any suitable material, and each of said strips isprovided with a beveled edge 29, and a rounded edge 30. The width of theclamping strips and the thickness of the drawing material insertedthereunder together being greater than the width of the slots causes therounded edges of the clamping strips to clamp the drawing material inthe lower corner of the slots of the edges and the beveled edges toclamp the said material against the vertical side walls of the slots sothat the more tension that is put on the drawing material or the tighterit is stretched the tighter it will be held in the slots, in fact itwill be impossible to pull it out without destroying or mutilating thesame. The stationary and extensible edges of the drawing board are eachprovided with holes 81, in which are inserted angular corner guides 32,by means of which the corners of the several edges are kept at theproper angle to each other.

To apply a piece of drawing material to the drawing board lay a sheet ofthe proper size thereon and fit or press the edges into the grooves withthe fingers, insert the clamping strips into the grooves, with theirrounded edges downward, then force the beveled edges downward until thedrawing material & 17, by means of is firmly clamped between saidbeveled edges and the vertical side walls of the cleats, then turn thescrew thumb nuts until the drawing material is drawn or stretched to thedesired tension. It is preferable to first adjust the expansible edgewhich is opposite the sta tionary edge so as to stretch the drawingmaterial lengthwise of the board first and then adjust the otherextensible edges and stretch it across the board by which means thetension on the drawing material will be equally distributed from thecenter of the board' To remove the drawing material from the thumb screwnuts, which releases the tension, and remove the clamp ing strips, whenthe drawing material will be free to be taken ofi". In case the clampingstrips should bind for any reason they can be easily removed byinserting the end of a steel point or other instrument in the groovesand under the edges of the clamping strips.

I do not desire to be understood as limiting myself to the specificdetails of construc tion and arrangement as herein described andillustrated, as it is manifest that variations and modifications may bemade in the features of construction and arrangement, on the adaptationof the device to various conditions of use without departing from thespirit and scope of my invention and improvements. I therefore reservethe right to all such variations and modifications as l l l l l properlyfall within the scope of my invention and the terms of the followingclaims.

hat I claim is z- 1. A drawing board provided with extensible edges eachhaving a slot and a paper clamping strip, the width of the lower portionof said strip and the thickness of the paper inserted thereundertogether being greater than the width of the bottom of the slot,substantially as described.

2. 'A drawing board provided with extensible edges each having a slotand a paper clamping strip seated obliquely in said s ot, the width ofthe lower portion of said strip and the thickness of the paper insertedthereunder together being greater than the width of the bottom of theslot, substantially as described.

3. A drawing board provided with extensible edges each having a slot anda paper clamping strip of such width that when the paper is insertedthereunder said stri will engage the wall of the slot and clamp t 1epaper against said wall at an angle to the bottom of the slot,substantially as described.

4. A drawing board provided with extensible edges each having a slot,means for adjusting the extensible edges, connected to the board and thelower portion of said edges, and a paper clamping strip, the width ofsaid strip and the thickness of the paper inserted thereunder togetherbeing greater than the width of the bottom of said slot, substantiallyas described.

5. A drawing board provided with laterally extended supports formedintegral with the cleats thereof, extensible edges supported by saidsupports, means for guiding said edges on said supports comprising slotsin the supports and pins in the said edges de signed to engage and slidein said slots, means for securing a piece of drawing paper to said edgesand means controlling the lat eral movement of said edges and connectingthem with the board whereby the tension on the drawing aper can beregulated, substantially as d escribed.

6. A drawing board provided with extensible edges each having a slotwith an inclined bottom and a slanting side wall and a paper clampingstrip one edge beveled and the other edge rounded, the width of saidstrip and the thickness of the paper inserted there under together beinggreater than the width of the bottom of the slot, substantially as described.

7. A drawing board provided with a non extensible edge having a slot,extensible edges each having a slot, and a paper clamping strip for thelower portion of each of said slots, the width of each of said stripsand the thickness of the paper inserted thereunder together beinggreater than the width of the bottom of the slots, substantially asdescribed.

8. A drawing board provided with cleats, screw bolts having their headsmounted therein and extensible edges provided with thumb nuts designedto travel on said bolts and adjust the said edges, substantially asdescribed.

9. A drawing board provided with cleats having slots therein, screwbolts the heads of which are mounted in said slots and extensible edgesprovided with thumb nuts which are designed to be mounted and travel onsaid screw bolts and adjust the extensible edges, substantially asdescribed.

10. A drawing board provided with extensible edges having angular guidesconnecting the same at the corners by means of which said edges are keptat the proper angle to each other, means carried by said edges forclamping the edge of a piece of drawing material and means for adjustingsaid edges connected to the board and edges, substantially as described.

In testimony whereof I have signed my name in the presence of twosubscribing witnesses.

WILLIAM FRANKLIN WAGNER.

Witnesses:

PHILIP F. LARNER, JAs. H. BLAOKWOOD.

